Maine health officials said they are seeing a small increase in the number of hepatitis A cases, with four cases reported over the past three months.

There have been six reported cases for 2017, health officials said, which is normal.

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"Outbreaks in several other U.S. states and European countries have shown that, while anyone not vaccinated against hepatitis A can get the illness, certain groups are at greater risk than others," officials said in a news release Monday.

Hepatitis A affects the liver. It spreads by swallowing something contaminated with feces from an infected person. Most infections occur through a sex partner, officials said.

Symptoms are usually sudden and include fatigue, low appetite, stomach pain, nausea and jaundice, officials said.

About 100 Americans die a year from hepatitis A, officials said.

"The best way to prevent hepatitis A infection is to get vaccinated," officials said.